• 제목/요약/키워드: Identification-based Trust

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스마트 그리드 환경에서 블록체인 기반 스마트 미터 인증 프로토콜 (Blockchain-based Smart Meter Authentication Protocol in Smart Grid Environment)

  • 김종현;김명현;박영호
    • 한국산업정보학회논문지
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    • 제28권5호
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    • pp.41-54
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    • 2023
  • 스마트 그리드는 효율적인 에너지 생산과 소비, 관리를 지원해주는 전력망 시스템으로 다양한 분야와 산업에서 활용되고 있다. 그러나 공개된 네트워크를 통해 서비스가 제공되는 환경에서는 보안 취약점과 개인정보 침해에 대한 신뢰 문제 해결은 필수적이다. 특히, 스마트 미터 단말의 식별정보는 중앙화된 서버를 통해 일괄적으로 관리되며, 중앙화된 관리 구조는 단말기 탈취, 데이터 위조 및 변조, 삭제 등 공격에 취약하다. 본 논문은 이러한 문제점을 해결하기 위해 탈중앙 분산원장 기술인 블록체인을 활용한 스마트 미터 인증 프로토콜을 제안한다. 제안된 방식은 블록체인을 통한 개별 스마트 미터 단말의 고유한 분산식별자(DID) 발급과 물리적복제방지기술(PUF)을 기반한 난수 값을 사용하여 데이터의 무결성과 신뢰성을 강화한다. 또한 비정형 보안 분석 및 AVISPA 시뮬레이션을 이용하여 제안한 방식의 안전성을 분석하고 관련 연구들과 비교하여 효율적인 방식임을 보인다.

IoT 환경에서 네트워크 코딩의 위장패킷 탐지와 유효한 복구의 식별 알고리즘 (Detection of Disguised Packet and Valid Reconstruction Identification Using Network Coding in IoT Environment)

  • 이용
    • 정보보호학회논문지
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    • 제30권1호
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    • pp.29-37
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    • 2020
  • 사물인터넷 기반의 응용서비스의 활용이 높아지고 네트워크 사용량이 급격히 증가함에 따라 네트워크 처리량을 개선하기 위하여 네트워크 코딩을 적용하는 연구가 활발하다. 네트워크 코딩에서 노드들은 주변 노드로부터 수신한 패킷을 여러 개 조합한 인코딩 패킷으로 변환하여 전송하고 목적지에서 디코딩할 수 있도록 한다. 이런 방식은 노드간 신뢰를 기반으로 하지만 노드의 참여가 자유로운 사물인터넷 환경에서는 악의적인 노드가 구성에 참여할 경우 패킷을 조작할 수 있게 된다. 목적지에서 수신된 패킷은 하나의 소스에서 전송한 것이 아니라 여러 노드에서 생성한 여러 패킷이 조합된 것이므로 인코딩된 패킷의 진위를 식별하는 것이 어렵게 된다. 본 논문에서는 목적지에서 수신한 패킷이 전송 중에 공격을 받아 "유효하게 식별되는" 위장된 패킷의 존재를 탐지하는 방법과 디코딩 결과 중에 유효한 메시지를 식별하는 방법을 제안한다. 이 방법은 목적지가 위장패킷의 존재에도 불구하고 높은 확률로 재전송없이 수신된 패킷만으로 유효한 메시지를 구할 수 있으므로 네트워크 코딩의 성능이 향상됨을 보여준다.

The validity and reliability of the Healthy Lifestyle Screening Tool

  • Kim, Cheong Hoon;Kang, Kyung-Ah
    • Physical Therapy Rehabilitation Science
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    • 제8권2호
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    • pp.99-110
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    • 2019
  • Objective: The aim of the present study was to develop a valid and reliable scale that measures the healthy life styles among young adults. Design: A methodological study design was employed to develop and validate the Healthy Lifestyle Screening Tool (HLST). Methods: The validity and reliability of the HLST were established in accordance with DeVellis' 8 steps guideline for tool development. The question items were generated based on literature reviews and interviews, which were then classified into 12 categories. The HLST was administered to 272 students attending a Korean university. The reliability was tested using Cronbach's alpha. The validity of the scale was examined with the mean inter-item correlations (MIIC) and factor analysis, and was also examined for content validity by experts. Results: The reliability of the HLST was found to be acceptable, as indicated by a Cronbach's alpha of 0.71. In the validity test, items with less than 80% "agreement" ratings on the content validity index by experts were revised. The MIIC values were greater than 0.25. A factor analysis of 36 items extracted 9 factors (i.e., four items per factor), which together explained 50.4% of the variance. The HLST consists of 36 items that measure 9 factors based on a 4-point Likert rating scale, with 4 items per factor, as follows: sunlight, water, air, rest, exercise, nutrition, temperance, trust, and general physical condition. High scores on the HLST are indicative of a healthy lifestyle (HL). Conclusions: The HLST is a valid and reliable scale that can be used to measure HL among young adults. Identification of HL by using the HLST can provide guidance to integrated therapeutic approaches along with conventional physical therapy.

옴니채널 브랜드에 대한 경험적 인식이 관계품질에 미치는 영향 (A Study on the Effect of Customers' Experimental Recognition of the Omni-Channel Brand on the Relationship Quality)

  • 옥정원;윤대홍;최태호
    • 한국산학기술학회논문지
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    • 제18권7호
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    • pp.448-458
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    • 2017
  • 본 연구는 옴니채널과 관련된 기존의 연구를 검토하고, 브랜드 체험과 소비자-브랜드 관계에 대한 문헌고찰을 통해서 옴니채널 브랜드에 대한 체험인식이 소비자-브랜드 관계품질과의 구조적 관계를 도출하였다. 연구모형을 검증하기 위해 부산지역 대학생과 직장인을 대상으로 하여 SSG.닷컴 이용경험이 있는 소비자를 대상으로 전체 250부의 설문지를 배포하여, 최종 210부의 설문이 연구모형 검증을 위해 이용되었다. 연구모형을 토대로 SPSS18.0과 LISREL8.3을 이용하여 가설을 검증한 결과 2개의 가설(가설 2-3, 가설 2-4)을 제외하고 모든 가설이 채택되었다. 이러한 연구 결과는 첫째, 소비자의 옴니 브랜드 체험은 감각(sence)을 통한 체험요인들의 전이효과를 통해 형성된 소비자의 인지적, 감정적 반응이 소비자의 행동에 중요한 요인으로 작용하는 것을 알 수 있다. 둘째, 소비자와 옴니채널 브랜드의 관계형성은 옴니 채널 브랜드에 대한 체험과 신뢰를 통한 애착과 심리적 유대감형성이 중요한 요임임을 알 수 있다. 따라서 본 연구결과는 최근 유통채널의 새로운 트렌드인 옴니채널에 대한 전략적 체험모듈(SEMs)과 공간 환경(Spatial Environment)관리에 대한 전반적인 이해 및 소비자 경험 및 관계적 인식과 관련된 이론적 및 실무적인 시사점을 제공할 수 있다.

보건의료 빅데이터의 연구목적 사용에 대한 법제 개선방안 (Improving Legislation on the use of Healthcare Data for Research Purposes)

  • 박대웅;정현학;정명진;류화신
    • 의료법학
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    • 제17권2호
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    • pp.315-346
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    • 2016
  • 빅데이터 처리기술의 발전과 함께 보건의료 빅데이터의 잠재적 가치도 크게 주목받고 있다. 그리고 이러한 잠재적 가치를 현실화하기 위해서는 보건의료 빅데이터를 이용한 다양한 연구가 필수적이다. 하지만 개인정보보호법을 중심으로 한 빅데이터 규제체계는 경제재로서의 빅데이터의 측면을 고려하지 못하고 있어, 이를 연구목적으로 활용하는데 많은 장애를 발생시키고 있다. 환자의 치료라는 1차적 목적을 중심으로 한 보건의료정보의 규제체계를 기술의 발전에 부합하며 공익적 활용이 용이한 형태로 개선시켜야 한다. 이를 위해서 개인정보의 보호와 활용의 균형에 대한 고민이 반영된 해외의 법제 동향을 살펴볼 필요가 있다. 해외 법제의 시사점을 바탕으로 우리 법제에서 다음과 같은 방향의 개선점을 도출할 수 있다. 우선 보건의료정보에 특화되고 보호와 활용을 아우르는 법제가 필요하다. 개인정보의 비식별화도 개인정보보호법의 적용이 배제되는 수준을 명확하게 규정해야 한다. 보건의료 빅데이터를 연계할 수 있는 법적 기반의 구축을 통해 관련 연구에 시너지 효과를 창출해야 한다. 외국에서의 논의에 대한 검토와 사회적 합의를 바탕으로 옵트아웃 제도의 도입도 고려해야 한다. 하지만 무엇보다 중요한 것은 이러한 시스템에 대한 국민의 신뢰일 것이다.

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대형마트 충성도의 이중경로모형 (Dual Path Model in Store Loyalty of Discount Store)

  • 지성구;이인구
    • 한국유통학회지:유통연구
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    • 제15권1호
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    • pp.1-24
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    • 2010
  • 국내 대형마트 점포 수는 2008년 기준 403개로 포화시점에 근접하고 있다. 이러한 경쟁상황에서 '점포충성도(store loyalty)'가 지속적 경쟁우위를 위한 전략적 도구로써 그 활용성이 점점 더 중요시 되고 있다. 다양한 관점에서 점포충성도를 대형마트 연구의 핵심적 과제 다루어왔으나, 통합적인 연구 접근 방법이 미흡한 실정이다. 따라서 본 연구에서는 통합적 관점에서 점포충성도가 형성되는 두 가지 경로를 제안하였다. 이중경로모형은 첫째, 내재적 경로 '서비스품질$\rightarrow$고객만족$\rightarrow$점포충성도', 둘째, 외재적 경로 '점포개성$\rightarrow$점포동일시$\rightarrow$점포 충성도'로 구성된다. 조사대상은 대형마트를 이용하는 소비자들을 대상으로 진행하였으며, 구조방정식모형 분석을 통하여 제안된 이중경로모형의 적합성 및 가설검증을 실시하였다. 연구결과, 모형의 적합지수들은 상당히 좋은 값들을 보여주고 있다. 또한 본 연구에서 새롭게 제시된 내재적 경로인 서비스품질은 고객만족에 정의 영향을 미치고, 고객만족은 결과변수인 대형마트의 점포충성도에 매우 유의하게 영향을 준 것으로 나타났다. 그리고 외재적 경로에서 대형마트의 점포개성은 점포동일시에 긍정적인 영향을 주고 매개변수인 점포개성은 점포충성도에 영향을 미치는 것으로 나타났다. 이를 통해 본 연구는 대형마트의 점포충성도 형성에 관한 두 가지 경로를 제시함으로써, 이론적, 관리적 시사점을 도출하였고 연구의 한계점과 미래연구방향을 제시하였다.

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RFID 응용 기술의 도입에 미치는 영향 요인에 관한 연구 (A Study on Factors for Adopting of RFID Application Technology)

  • 박차길;이선규
    • 한국산학기술학회논문지
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    • 제9권4호
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    • pp.1018-1029
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    • 2008
  • 본 연구에서는 RFID 응용 기술의 도입 요인을 관련 정보 기술 즉, ERP, SCM, EDI 등과 같은 정보 시스템의 도입 요인을 문헌 연구를 통하여 살펴보면서 RFID 응용 기술의 도입 요인을 Delphi 방법으로 도출 하였다. 위 3개 분야의 정보 기술 도입 요인은 ERP 분야는 41개, SCM 분야는 42개, EDI 분야는 33개의 도입 요인이 도출되어 총 116개의 도입 요인들이 추출되었으며, 이들 116개의 도입 요인을 바탕으로 RFID 응용 기술의 도입 요인을 도출하였다. 델파이 조사를 통해 최종적으로 9개의 도입 요인(태그 관련 비용, 거래업체와의 관계, 기술의 호환성, 정보 기술 기반 구조, 기업 간 신뢰 및 조정, 산업 내 경쟁 강도, RFID 기술의 표준화, 최고 경영층의 지원, 거래기업의 참여도)을 도출하였다. 본 연구에서 제시된 도입 요인들은 ERP, SCM, EDI 등과 같은 정보 기술의 도입 요인들과 RFID 응용 기술의 도입 요인들과는 다소 다르다는 점을 발견할 수 있었다. 그 중에서 태그 관련 비용과 RFID 기술의 표준화 등과 같은 요인들은 RFID 응용 기술의 도입에 걸림돌로 지적되고 있는 것으로 나타났다.

조직의 자원을 고려한 RFID 도입단계별 영향요인에 관한 실증연구 (An Empirical Study on the Factors Affecting RFID Adoption Stage with Organizational Resources)

  • 장성희;이동만
    • Asia pacific journal of information systems
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    • 제19권3호
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    • pp.125-150
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    • 2009
  • RFID(Radio Frequency IDentification) is a wireless frequency of recognition technology that can be used to recognize, trace, and identify people, things, and animals using radio frequency(RF). RFID will bring about many changes in manufacturing and distributions, among other areas. In accordance with the increasing importance of RFID techniques, great advancement has been made in RFID studies. Initially, the RFID research started as a research literature or case study. Recently, empirical research has floated on the surface for announcement. But most of the existing researches on RFID adoption have been restricted to a dichotomous measure of 'adoption vs. non-adoption' or adoption intention. In short, RFID research is still at an initial stage, mainly focusing on the research of the RFID performance, integration, and its usage has been considered dismissive. The purpose of this study is to investigate which factors are important for the RFID adoption and implementation with organizational resources. In this study, the organizational resources are classified into either finance resources or IT knowledge resources. A research model and four hypotheses are set up to identify the relationships among these variables based on the investigations of such theories as technological innovations, adoption stage, and organizational resources. In order to conduct this study, a survey was carried out from September 27, 2008 until October 23, 2008. The questionnaire was completed by 143 managers and workers from physical distribution and manufacturing companies related to the RFID in South Korea. 37 out of 180 surveys, which turned out unfit for the study, were discarded and the remaining 143(adoption stage 89, implementation stage 54) were used for the empirical study. The statistics were analyzed using Excel 2003 and SPSS 12.0. The results of the analysis are as follows. First, the adoption stage shows that perceived benefits, standardization, perceived cost savings, environmental uncertainty, and pressures from rival firms have significant effects on the intent of the RFID adoption. Further, the implementation stage shows that perceived benefits, standardization, environmental uncertainty, pressures from rival firms, inter-organizational cooperation, and inter-organizational trust have significant effects on the extent of the RFID use. In contrast, inter-organizational cooperation and inter-organizational trust did not show much impact on the intent of RFID adoption while perceived cost savings did not significantly affect the extent of RFID use. Second, in the adoption stage, financial issues had adverse effect on both inter-organizational cooperation and the intent against the RFID adoption. IT knowledge resources also had a deterring effect on both perceived cost savings and the extent of the RFID adoption. Third, in the implementation stage, finance resources had a moderate effect on environmental uncertainty and extent of RFID use while IT knowledge resources had also a moderate effect on perceived cost savings and the extent of the RFID use. Limitations and future research issues can be summarized as follows. First, it is difficult to say that the sample is large enough to be representative of the population. Second, because the sample of this study was conducted among manufacturers only, it may be limited in analyzing fully the effect on the industry as a whole. Third, in consideration of the fact that the organizational resources in the RFID study require a great deal of researches, this research may deem insufficient to fulfill the purpose that it initially set out to achieve. Future studies using performance research are, therefore, needed to help better understand the organizational level of the RFID adoption and implementation.

산욕초기 초산모의 간호목표달성방번 합의가 어머니 역할수행에 대한 자신감 및 만족도에 미치는 영향에 관한 실험적 연구 (An experimental study on the impact of an agreement on the means to achieve nursing goals in the early postpartum period of primiparous mothers and enhance their self-confidence and satisfaction in maternal role performance)

  • 이영은
    • 대한간호학회지
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    • 제22권1호
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    • pp.81-115
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    • 1992
  • The problem addressed by this study was to determine the effect of nurse - patient agreement on the means to achieve nursing goals in the early postpartum period of primiparous mothers. It was hypothesized that the experimental treatment would result in hegher self-confidence and satisfaction in maternal role performance. This purpose was to contribute to the planning of nursing care to enhance self- confidence and satisfaction in maternal role performance and to the development of relevant nursing theory. Especially, the early postpartum period is crucial toward in recovery from childbirth and attainment of the maternal role. Maternal role attaintment is a complex social and cognitive process of stimulus -response accomplished by learning. Most women attain the maternal role sucessfully. But, some primiparous mothers experience difficultites in attainment of the maternal role due to lack of experience and knowledge. Self-confidence and satisfaction in maternal role performance are important factors in attainment and adjustment to the maternal role (Mercer, 1981a, 1981b ; Lederman, Weigarten, and Lederman, 1981 :Bobak and Jensen, 1985). Nursing is defined as behaviors of nurses add patients that attain nursing goals through action, reaction, interaction, and transaction. For attainment of nursing goals, active participating transactions must occur by agreement on the means to achieve those goals through nurse -patient mutual goal setting and establishment of their active relationships(King, 1981, Ha, 1977). Based on King's theory of goal attainment (1981), this stuy was planned as a non-equivalent control group, non -synchronized quasi -experimental design using agreement on the means to achieve nursing goals in early postpartum as the experimental treatment. The data were collected from July 20 to Sep. 1, 1991 by questionnaires with 60 primiparous mothers planing to breast feed after normal deliveries at W hospital in Pusan, Korea. The subjects were divided into a control group(conventional group) -those admitted from July 20 to Aug. 12, and an experimental group(agreement group) - those admitted from Aug. 13 to Sep. 1. The instument for agreement on the means to nursing goals in the early postpartum period included five steps - identification of disturbances of problems through action, reaction, and interaction with primiparous mothers : mutual early postpartal nursing goal setting : exploration of the means to achieve goals ; agreement on the means (self- care, ealry maternal -infant contact, performance of mothering behavior, and communicating about the infant's behavior and health condition) : implementation of the means. This instrument was developed on the basis of King's elements that lead to transactions in nurse-patient interactions. Lederman et al's (1981) scale for Confidence in ability to cope with tasks of motherhood and Lederman et al's(1981) scale for Mother's satisfaction with motherhood and infant care were used to measure self-confidence and satisfaction in maternal role performance ·with the subjects immediately after admission and on the day of discharge. Self-care performance in the experimental group was measured by self -evaluation tool developed by the investigator from the literature concerned. The tools to measure Pelf-confidence and satisfaction in maternal role performance, and the tool to measure self-evaluation of self-care performance were tested for internal reliability. Cronbach's Alphas were 0.94, 0.94, and 0.63. The data were analysed by using in S.P.S.S. computerized program and included percentage, x²-test, t-test, ANOVA, and Pearson Correlation Coefficient. The conclusions obtained from this study are summerized as follows : 1. The degree of self-confidence in maternal role performance of the total subjects group measured before the experimental treatment was above average with a mean score of 2.77(range 2.14-3.64). Out of 14 items, those with relatively high mean scores were ‘I would like to be a better mother than I am’(3.95), and ‘I have my doubts about whether I am a good mother’(2.87). Those with low mean scores were ‘I know that my baby wants most of the times’(2.28), ‘When the baby cries, I can tell what she /he wants’(2.37), and ‘I have confidence in my ability to care for the baby’(2;50). That is, the self - confidence of Primiparous mothers was considerably high in mothering, but rather low in activities concerning the infant care and understanding of the infant behavior. The degree of satisfaction in maternal role performance of the total subjects group measured before the experimental treatment was high with a mean score of 3.18(range 1.92-3.92). Out of 13 items, those with relatively high mean scores were ‘I am glad 1 had this baby now’(3.75), ‘I play with the baby between feedings when s/he is awake and quiet’(3.67), and ‘I enjoy being a mother’(3.27). Those with low mean scores were ‘I am upset about having too many responsibilities as a mother’(2.78), ‘It bothers me to get up for the baby at night’(2.82), and ‘I get annoyed if the baby frequently interrupts my activities’.(2.82), That is, the satisfaction of primiparous mothers was considerably high in mothering and infant care, but rather low in restraints in time or on the mother's self accomplishment and development. 2. Agreement on the means to achieve nursing goals in the early postpartum period included process of mutual goal setting, exploration of the means to achieve goals, and ahreement in concert means to achieve goals based on the mothers' condition, concerns, self-perception of the nurse - patient interactions. In the process of agreement, there was agreement that the means to achieve goals should be through trust and establishment of active relationships with the nurse through identification of problems according to planned nursing goals and active interaction, such as explanations, teaching, changing of opinions, acceptance or rejection of explanations, and proposing of questions. Therefore agreement on the means to achieve nursing goals in the early postpartum period appears to be an effective nursing intervention for primiparous mothers. 3. The degree of self- confidence in maternal role performance of the exprimental group was higher than that of the control group(t=3.95, p<0.01). Out of 14 items, those with higher score in the experimental group were ‘I would like to be a better mother than I am’(t=1.93, p<0.05), ‘I know that my baby wants most of the times’(t=2.75, p<0.01), ‘When the baby cries, 1 can tell what she/he wants’(t=2.10, p<0.05), ‘I have confidence in my ability to care for the baby’(t=3.72, p<0.01), ‘I trust my own judement in deciding how to care for the baby’(t=1.96, p<0.05), ‘I feel that I know my baby and what to do for him /her’(t=2.44, p<0.01), ‘I am concerned about being able to meet the baby's needs’(t=2.87, p<0.01), ‘I know what my baby likes and dislikes’(t=3.26, p<0.01), ‘I don't know to care for the baby as well as I should’(t=2.07, p<0.05), and ‘I am unsure about whether I give enough attention to the baby’(t=3.04, p<0.01), That is, the degree of self-confidence in mothering, activities concerning infant care, and understanding of infant behavior of the experimental group was higher than that of the control group. Therefore, the first hypothesis, that the degree of self-confidence in maternal role performance of the experimental group would be higher than that of the control group, was supported(t=3.95, p<0.01). 4. The degree of satisfaction in the maternal role performance of the exprimental group was higer than that or the control group(t=2.31, p<0.05). Out of 13 items, those with higher score in the experimental group were ‘I am glad I had this baby now’(t=2.29, p<0.05), ‘I enjoy taking care of the baby’(t=2.4g, p<0.01), ‘It is boring for me to care for the baby and do the same thing over and over’(t=2.87, P<0.01), ‘I am unhappy with the amount of time I have for activities other than childcare’(t=2.51, p<0.01), and ‘When bathing and diapering the baby, I would like to be doing something else’(t=2.43, p<0.01). That is, the degree of satisfaction in mothering, infant care, and restraints in time of on the mother's self accomplishment and development in the experimental group was higher than that of the control group. Therefore, the second hypothesis, that the degree of satisfaction in maternal role performance of the experimental group would be higher than that of the control group, was supported(t=2.31, p<0.05). 5. The third hypothesis, that the higher the degree of satisfaction in materenal role performance, the higher the degree of self-confidence in materenal role performance in the experimental group, was supported (r=0.57, p<0.01)

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지식이전 선행요인에 관한 다차원 분석: 사회적 자본 이론과 사회연결망 이론의 결합 (Multi-level Analysis of the Antecedents of Knowledge Transfer: Integration of Social Capital Theory and Social Network Theory)

  • 강민형;허용석
    • Asia pacific journal of information systems
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    • 제22권3호
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    • pp.75-97
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    • 2012
  • Knowledge residing in the heads of employees has always been regarded as one of the most critical resources within a firm. However, many tries to facilitate knowledge transfer among employees has been unsuccessful because of the motivational and cognitive problems between the knowledge source and the recipient. Social capital, which is defined as "the sum of the actual and potential resources embedded within, available through, derived from the network of relationships possessed by an individual or social unit [Nahapiet and Ghoshal, 1998]," is suggested to resolve these motivational and cognitive problems of knowledge transfer. In Social capital theory, there are two research streams. One insists that social capital strengthens group solidarity and brings up cooperative behaviors among group members, such as voluntary help to colleagues. Therefore, social capital can motivate an expert to transfer his/her knowledge to a colleague in need without any direct reward. The other stream insists that social capital provides an access to various resources that the owner of social capital doesn't possess directly. In knowledge transfer context, an employee with social capital can access and learn much knowledge from his/her colleagues. Therefore, social capital provides benefits to both the knowledge source and the recipient in different ways. However, prior research on knowledge transfer and social capital is mostly limited to either of the research stream of social capital and covered only the knowledge source's or the knowledge recipient's perspective. Social network theory which focuses on the structural dimension of social capital provides clear explanation about the in-depth mechanisms of social capital's two different benefits. 'Strong tie' builds up identification, trust, and emotional attachment between the knowledge source and the recipient; therefore, it motivates the knowledge source to transfer his/her knowledge to the recipient. On the other hand, 'weak tie' easily expands to 'diverse' knowledge sources because it does not take much effort to manage. Therefore, the real value of 'weak tie' comes from the 'diverse network structure,' not the 'weak tie' itself. It implies that the two different perspectives on strength of ties can co-exist. For example, an extroverted employee can manage many 'strong' ties with 'various' colleagues. In this regards, the individual-level structure of one's relationships as well as the dyadic-level relationship should be considered together to provide a holistic view of social capital. In addition, interaction effect between individual-level characteristics and dyadic-level characteristics can be examined, too. Based on these arguments, this study has following research questions. (1) How does the social capital of the knowledge source and the recipient influence knowledge transfer respectively? (2) How does the strength of ties between the knowledge source and the recipient influence knowledge transfer? (3) How does the social capital of the knowledge source and the recipient influence the effect of the strength of ties between the knowledge source and the recipient on knowledge transfer? Based on Social capital theory and Social network theory, a multi-level research model is developed to consider both the individual-level social capital of the knowledge source and the recipient and the dyadic-level strength of relationship between the knowledge source and the recipient. 'Cross-classified random effect model,' one of the multi-level analysis methods, is adopted to analyze the survey responses from 337 R&D employees. The results of analysis provide several findings. First, among three dimensions of the knowledge source's social capital, network centrality (i.e., structural dimension) shows the significant direct effect on knowledge transfer. On the other hand, the knowledge recipient's network centrality is not influential. Instead, it strengthens the influence of the strength of ties between the knowledge source and the recipient on knowledge transfer. It means that the knowledge source's network centrality does not directly increase knowledge transfer. Instead, by providing access to various knowledge sources, the network centrality provides only the context where the strong tie between the knowledge source and the recipient leads to effective knowledge transfer. In short, network centrality has indirect effect on knowledge transfer from the knowledge recipient's perspective, while it has direct effect from the knowledge source's perspective. This is the most important contribution of this research. In addition, contrary to the research hypothesis, company tenure of the knowledge recipient negatively influences knowledge transfer. It means that experienced employees do not look for new knowledge and stick to their own knowledge. This is also an interesting result. One of the possible reasons is the hierarchical culture of Korea, such as a fear of losing face in front of subordinates. In a research methodology perspective, multi-level analysis adopted in this study seems to be very promising in management research area which has a multi-level data structure, such as employee-team-department-company. In addition, social network analysis is also a promising research approach with an exploding availability of online social network data.

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